All of a sudden my navigation switched to KM. I went to General Settings and changed it back to miles then went to navigation to put in the destination. The guidance was in miles. The problem is when I come back another time to input a destination, it has gone back to KM. What the heck? Why didn't it save it when I reset it to miles in General Settings? Now I have to go into General Settings every time and change it to miles before I input a destination. Any ideas?